Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means between charger and mold to cut off flow of...
Patent
1989-08-29
1991-06-11
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means between charger and mold to cut off flow of...
2643289, 26432815, 425570, 425572, B29C 4522, B29C 4523
Patent
active
050228463
ABSTRACT:
A multi-cavity valve gates injection molding system. The pneumatic actuating mechanism to reciprocate each elongated valve member includes a piston which reciprocates in a cylindrical opening through a cylinder plate. A sealing bushing which is mounted around each valve member has a flanged portion which bridges an insulative air gap between the manifold and the cylinder plate. Thus, the sealing bushing forms part of the piston cylinder as well as sealing against melt leakage around the reciprocating valve member. The piston has a circumferential outer band formed of a graphite alloy seated in a groove formed between a front portion and a removable rear plate portion.
REFERENCES:
patent: 4268240 (1981-05-01), Rees et al.
patent: 4340204 (1982-07-01), Herd
patent: 4711752 (1987-12-01), Deacon et al.
patent: 4740151 (1988-04-01), Schmidt
Heitbrink Timothy W.
Mold-Masters Limited
Woo Jay H.
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